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authorEmese Revfy <re.emese@gmail.com>2016-06-20 20:42:34 +0200
committerKees Cook <keescook@chromium.org>2016-10-10 14:51:45 -0700
commit0766f788eb727e2e330d55d30545db65bcf2623f (patch)
tree0436ae3b005558a4fb827459fe5c602037fe764a /include/linux/random.h
parent38addce8b600ca335dc86fa3d48c890f1c6fa1f4 (diff)
latent_entropy: Mark functions with __latent_entropy
The __latent_entropy gcc attribute can be used only on functions and variables. If it is on a function then the plugin will instrument it for gathering control-flow entropy. If the attribute is on a variable then the plugin will initialize it with random contents. The variable must be an integer, an integer array type or a structure with integer fields. These specific functions have been selected because they are init functions (to help gather boot-time entropy), are called at unpredictable times, or they have variable loops, each of which provide some level of latent entropy. Signed-off-by: Emese Revfy <re.emese@gmail.com> [kees: expanded commit message] Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'include/linux/random.h')
-rw-r--r--include/linux/random.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/random.h b/include/linux/random.h
index a59c74cdb1eb..d80a4388a4fd 100644
--- a/include/linux/random.h
+++ b/include/linux/random.h
@@ -30,8 +30,8 @@ static inline void add_latent_entropy(void) {}
#endif
extern void add_input_randomness(unsigned int type, unsigned int code,
- unsigned int value);
-extern void add_interrupt_randomness(int irq, int irq_flags);
+ unsigned int value) __latent_entropy;
+extern void add_interrupt_randomness(int irq, int irq_flags) __latent_entropy;
extern void get_random_bytes(void *buf, int nbytes);
extern int add_random_ready_callback(struct random_ready_callback *rdy);